How Vacuum Excavation Supports PAS 128 and HSG47 Compliance

Working safely around buried utilities has never been more important. As underground infrastructure becomes increasingly congested, the risk associated with excavation work continues to rise. In response, industry standards such as PAS 128 and HSG47 have become central to how excavation projects are planned, managed, and delivered across the UK.

For contractors, utilities, and civil engineering teams, compliance with these standards isn’t just about paperwork – it directly affects site safety, programme certainty, and commercial risk. This is where vacuum excavation plays a critical role.

For a complete overview of how vacuum excavation fits into modern projects, including hiring, use cases, and site preparation, see our guide to vacuum excavator hire in the UK.

In this article, we explain how vacuum excavation supports PAS 128 and HSG47 compliance, why it is now widely regarded as best practice when working near buried services, and how it helps contractors meet both safety and regulatory expectations on live sites.

Why Compliance Matters More Than Ever in Modern Excavation

Excavation work has always carried risk, but the nature of that risk has changed. Fibre rollouts, ageing infrastructure, utility upgrades, and urban development have created complex underground environments where traditional mechanical excavation is often unsuitable.

On many sites, compliance becomes a real issue when conditions don’t match expectations. Excavation begins based on available records, only for services to appear in unexpected positions. At that point, continuing with mechanical excavation introduces unnecessary risk, and a more controlled method of exposing services becomes essential.

Service strikes can result in:

• Serious injury or worse
• Major service disruption
• Cost of service strikes and project delays
• Programme delays
• Reputational damage

As a result, regulators, asset owners, and insurers are placing far greater emphasis on safe digging practices. PAS 128 and HSG47 sit at the heart of this approach, providing clear guidance on how buried services should be located, verified, and protected.

Vacuum excavation aligns closely with both standards, which is why it has become a preferred excavation method on compliant projects.

What Is PAS 128 and Why Is It Important?

PAS 128 is the specification for underground utility detection, verification, and location. It provides a structured framework for identifying buried services before and during excavation works.

At its core, PAS 128 is about reducing uncertainty. It sets out different quality levels for utility surveys and encourages verification where asset records or detection data alone may not be sufficient.

In practice, this means that where uncertainty exists, verification is not optional. Trial holes must be carried out in a way that confirms service position without introducing additional risk, which is why vacuum excavation is widely used for this stage of work.

A key part of PAS 128 compliance is the use of trial holes to confirm the position, depth, and orientation of services. This is where vacuum excavation becomes particularly valuable.

How Vacuum Excavation Supports PAS 128 Compliance

Vacuum excavation is ideally suited to PAS 128 verification work because it allows services to be exposed safely and accurately without physical contact.

When carrying out trial holes:

• Soil is removed gradually using air and suction
• Services are revealed in a controlled manner
• The risk of damage during exposure is significantly reduced

Standards such as the PAS 128 specification for underground utility detection emphasise the importance of verification through trial holes, particularly where records or survey data alone cannot provide sufficient confidence.

This approach allows surveyors and contractors to visually confirm service locations and update records with confidence. In many cases, vacuum excavation is the safest and most practical way to achieve PAS 128-compliant verification, particularly in congested or high-risk areas.

For a practical look at exposing underground services safely, see how this method is applied on live utility projects.

What Is HSG47 and How Does It Apply to Excavation Work?

HSG47 is the Health and Safety Executive’s guidance on avoiding danger from underground services. It applies to anyone involved in excavation or groundworks, from planners and designers through to site operatives.

The guidance sets out clear expectations around:

• Planning and risk assessment
• Use of service records and detection tools
• Safe digging practices
• Avoiding mechanical excavation near known services

HSG47 makes it clear that once services are suspected or known to be present, excavation methods must be chosen carefully to minimise risk.

How Vacuum Excavation Aligns With HSG47 Guidance

One of the key principles of HSG47 is avoiding the use of mechanical excavation where it could endanger buried services. Vacuum excavation directly supports this principle by removing the need for metal buckets or teeth near live assets.

Compared to mechanical excavation, where contact with services can occur without warning, vacuum excavation provides a controlled method of working that significantly reduces the likelihood of accidental damage. This is particularly important in high-risk environments where compliance expectations are highest.

Because vacuum excavation:

• Eliminates direct contact with services
• Provides clear visibility during exposure
• Allows controlled excavation in sensitive zones

It aligns naturally with the HSG47 guidance on avoiding danger from underground services published by the Health and Safety Executive.

For contractors, using vacuum excavation demonstrates a proactive approach to risk management and safe digging.

Reducing Risk on Site Through Non-Destructive Excavation

Both PAS 128 and HSG47 aim to reduce risk – not just on paper, but in real working environments. Vacuum excavation supports this by providing a non-destructive excavation method that prioritises control and visibility.

This is particularly important when:

• Asset records are incomplete or inaccurate
• Multiple services are present at shallow depth
• Work is being carried out in public or high-traffic areas
• Excavation is taking place near critical infrastructure

This approach also aligns with wider best practice outlined in the Health and Safety Executive excavation safety guidance, which highlights the importance of planning, risk assessment, and controlled excavation methods.

By reducing reliance on mechanical digging, vacuum excavation lowers the likelihood of incidents that could otherwise compromise compliance and safety outcomes.

The Role of Vacuum Excavation in Planned and Reactive Works

Compliance doesn’t stop when projects become reactive. Emergency repairs and unplanned works still fall under the same safety expectations, and in many cases carry even higher risk.

Vacuum excavation is widely used on:

• Emergency utility repairs
• Leak detection and investigation
• Service exposure following unexpected discoveries
• Reactive maintenance in congested environments

Its ability to be mobilised quickly while still supporting PAS 128 and HSG47 principles makes it a practical choice for both planned and unplanned excavation works.

For teams needing rapid response, see how emergency vacuum excavation response supports safe excavation even under time pressure.

Why Asset Owners and Principal Contractors Expect Vacuum Excavation

Across the utilities sector, asset owners and principal contractors are increasingly specifying operated vacuum excavation hire as part of their safe digging requirements.

This is driven by:

• Improved safety performance
• Reduced number of service strikes
• Better audit outcomes
• Lower insurance exposure

For contractors, aligning with these expectations is becoming essential. Using vacuum excavation helps demonstrate compliance, professionalism, and a commitment to industry best practice.

At John Mee VAC-EX Hire, we support contractors working within PAS 128 and HSG47 frameworks by providing experienced operators and reliable equipment suited to high-risk environments.

Common Questions About PAS 128 and HSG47 Compliance

Is vacuum excavation required for PAS 128 compliance?

Not always required, but it is widely used for safe verification of underground services.

Does HSG47 recommend vacuum excavation?

HSG47 does not mandate specific methods, but it emphasises avoiding mechanical excavation near services, which vacuum excavation supports.

Why is service verification important?

It confirms the position and depth of utilities, reducing risk and improving safety during excavation.

Why Vacuum Excavation Is Central to PAS 128 and HSG47 Compliance

As expectations around excavation safety continue to rise, compliance with PAS 128 and HSG47 is no longer optional. Vacuum excavation provides a practical, proven way to meet these requirements while reducing risk on site.

By enabling safe verification, avoiding mechanical contact with buried services, and supporting controlled excavation in sensitive environments, it has become central to modern compliant excavation practices.

For contractors and utilities working across the UK, adopting vacuum excavation is not just about meeting standards – it’s about protecting people, assets, and programmes in an increasingly complex underground landscape.

If you need support delivering compliant excavation works, you can contact John Mee VAC-EX Hire to discuss availability and site requirements.